I have a client who has had intermittent trouble sending and receiving emails. This morning I responded to one of his emails, and the response came back to me with the following error:
The following addresses had permanent fatal errors --- <email address> reason: 550 IP address is listed on uce-dnsbl1.rbl.spamrl.com.
Please organise removal and retry.
How can I deal with this on his behalf? I checked his IP address at www.spamrl.com/lookup
, and the results were mixed and "not blacklisted".